3NM at temp also resulted in my aluminum block failing. Hardened steel nozzle started to tighten but then the threads on the block failed before reaching 3NM using a quality torque wrench. Now the nozzle can spin freely inside the block and plastic leaks between the block and the heat break when I attempted to use it.
Currently waiting for another block to arrive. I would advise people to not go above 2NM if using a torque wrench, it should be plenty when at temp.
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